Despite criticism from most states about the Trump administration’s request for voters’ personal information, half have said they will deliver some or all of that data to the White House election commission.

And that number could grow, President Donald Trump said on Wednesday, with more than 30 states turning over some information, including names, addresses and birth dates, to the group being run by Kansas Secretary of State Kris Kobach.

“If any state does not want to share this information, one has to wonder what they’re worried about,” Trump said, questioning the motives of states that have not complied with requests for information. “ What are they worried about? There’s something. There always is.”